All media that is not a geology image.

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US geologic map

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Basin and Ranges Pluvials

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Sawtooth Peak, California

Sawtooth Peak in California.

Sawtooth Peak (right) capped by Columbia River Basalt. Beneath it is granite of the Wallowa Batholith –and off to the left, are the bedded rocks of the Martin Bridge Limestone. (Image ID# 140713-43e)

Earthquake-damage. New Zealand

Earthquake-damage. New Zealand

Marine Transgression diagram

Marine transgression

If you look at Time 1, you can see a coastline in cross-section, with sand being deposited closest to shore, mud a little farther out, and eventually carbonate material even farther out. As sea levels rise in Time 2, the sites of deposition for these materials migrates landward, putting mud deposition on top the earlier sand deposition and so on. In time 3, the sequence moves even farther landward, resulting in carbonate over mud over sand. If these materials become preserved and turned into rock, they form the sequence sandstone overlain by shale overlain by limestone – just what we see on top the Great Unconformity. (Image ID# transgression)

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